Chain tensioning mechanism

Abstract

The utility model discloses a chain tensioning mechanism which comprises a machine body, a rotatable chain is installed on the machine body, the chain tensioning mechanism is further installed on the machine body, the chain tensioning mechanism comprises a guide plate, a spring piece and a limiting pin, the upper surface of the guide plate abuts against the outer side face of the chain, one end of the guide plate is installed on the machine body in a rotatable mode, and the other end of the guide plate abuts against the limiting pin. The limiting pin is installed on the machine body, the spring piece is located between the limiting pin and the guide plate and bends with the limiting pin as a fulcrum, and the two ends of the spring piece abut against the two ends of the guide plate respectively. The chain tensioning mechanism has the advantages that the chain tensioning mechanism is arranged and can be adaptively adjusted according to the impact force of the chain in the use process of the chain, so that tensioning of the chain is guaranteed, and the chain tensioning mechanism adapts to the impact of the chain on the guide plate.

Description

Technical Field

[0001] The utility model relates to oil pump chain tensioning, in particular to a chain tensioning mechanism. Background Art

[0002] Most of the existing oil pump chains are not equipped with a tensioning mechanism. Market feedback shows that the chains have problems such as sleeve cracking and abnormal noise. Some oil pump chains use a chute to support and tension the chain. However, during use, due to the complex driving conditions, including acceleration, deceleration, and steady driving, and the acceleration and deceleration amplitudes are different, the existing tensioning mechanism is not well used for tensioning the oil pump chain. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a chain tensioning mechanism.

[0004] The purpose of the utility model is achieved through the following technical solutions: a chain tensioning mechanism, including a fixedly installed limit pin, a rotatably installed guide plate and a spring sheet, one end of the guide plate is a rotating part, the spring sheet is located between the limit pin and the guide plate, and the spring sheet is bent with the limit pin as a fulcrum, and the two ends of the spring sheet are respectively in contact with the two ends of the guide plate.

[0005] Optionally, the guide plate includes an arc-shaped plate body, and a rotating portion is provided at the left end of the arc-shaped plate body.

[0006] Optionally, a resisting portion is provided on the rotating portion, and the left end of the spring sheet abuts against the resisting portion, forming a first slot between the resisting portion and the left end portion of the arc-shaped plate body, and a tongue portion is provided at the bottom of the right end of the arc-shaped plate body, extending to the left, and forming a second slot between the tongue portion and the arc-shaped plate body, and an inner lining plate is installed on the arc-shaped plate body, with the left end of the inner lining plate stuck in the first slot and the right end of the inner lining plate stuck in the second slot.

[0007] Optionally, a first card block is provided on the end face of the resisting portion close to the first card slot, and a wedge-shaped surface is provided on the outer side face of the first card block; a second card block is provided on the end face of the tongue close to the second card slot, and a wedge-shaped surface is also provided on the outer side face of the second card block; avoidance notches are provided on both ends of the inner lining plate, and the first card block and the second card block are both located at the corresponding avoidance notches.

[0008] Optionally, the contact surface of the blocking portion that contacts the spring sheet is an arc-shaped surface.

[0009] Optionally, a hanging portion is provided on the inner side or outer side of the tongue, a limiting portion is provided on the inner side surface of the hanging portion, and an accommodating gap for accommodating the spring sheet is provided between the limiting portion and the tongue.

[0010] Optionally, a raised positioning post is further provided at the bottom of the tongue, and a positioning hole corresponding to the positioning post is opened at the right end of the spring sheet, and the positioning post passes through the positioning hole.

[0011] Optionally, a through hole is provided on the rotating portion, and a screw is sleeved in the through hole.

[0012] Optionally, the screw is a stepped screw, a sleeve is mounted on the small diameter rod of the stepped screw, there is always a gap between the end face of the rotating part close to the sleeve and the sleeve, and a baffle extending upward is provided on the outer side wall of the arc-shaped plate.

[0013] Optionally, the spring sheet is a multi-layer spring sheet superposition structure.

[0014] The utility model has the following advantages: the chain tensioning mechanism of the utility model, by setting the chain tensioning mechanism, can make adaptive adjustments according to the impact force of the chain during the use of the chain, thereby ensuring the tension of the chain and adapting to the impact of the chain on the guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 Schematic diagram of the tensioning mechanism Figure 1 ;

[0017] Figure 3 Schematic diagram of the tensioning mechanism Figure 2 ;

[0018] Figure 4 Schematic diagram of the structure of the guide plate;

[0019] Figure 5 for Figure 3 Schematic cross-sectional view of AA in the figure;

[0020] Figure 6 Schematic diagram of the structure of the inner lining plate;

[0021] In the figure, 100-machine body, 200-chain, 300-chain tensioning mechanism, 1-guide plate, 2-spring sheet, 3-limit pin, 4-screw, 5-washer sleeve, 6-inner lining plate, 11-arc plate, 12-rotating part, 13-blocking part, 14-tongue, 15-hanging part, 16-limiting part, 17-positioning column, 18-baffle, 19-first slot, 20-first block, 21-second slot, 22-second block. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 and Figure 2As shown, a chain tensioning mechanism comprises a fixedly mounted limit pin 3, a rotatably mounted guide plate 1 and a spring sheet 2, one end of the guide plate 1 is a rotating portion 12, the spring sheet 2 is located between the limit pin 3 and the guide plate 1, and the spring sheet 2 is bent with the limit pin 3 as a fulcrum, and the two ends of the spring sheet 2 are respectively abutted against the two ends of the guide plate 1. In this embodiment, the tensioning of the diesel engine oil pump chain 200 is taken as an example to illustrate the use of the chain tensioning mechanism 300. The diesel engine has a body 100, a rotatable chain 200 is mounted on the body 100, and a chain tensioning mechanism 300 is mounted on the body 100, the rotating portion 12 at one end of the guide plate 1 is rotatably mounted on the body 100, the limit pin 3 is mounted on the body 100, and the spring sheet 2 is located between the limit pin 3 and the guide plate 1. When the guide plate 1 is rotated, the spring piece 2 can also rotate around the limit pin 3, and the spring piece 2 is bent with the limit pin 3 as the fulcrum, and its two ends abut against the guide plate 1. When the guide plate 1 is impacted, the guide plate 1 is subjected to force, which causes the guide plate 1 to rotate relative to the body 100. After the guide plate 200 rotates, the spring piece 2 is deformed. After the spring piece 2 is deformed, an elastic reaction force is generated, and the elastic reaction force can be transmitted to the guide plate 1, The elastic reaction force can hinder the rotation of the guide plate 1, thereby ensuring the tension of the chain 200, and when the impact force on the guide plate 1 tends to be balanced, the guide plate 1 can adaptively find a suitable position. At this time, the deformation of the spring sheet 2 tends to be stable, and then the elastic reaction force is relatively stable, thereby stably ensuring the tension of the chain 200. In specific use, the chain 200 generally has the greatest impact force on the guide plate 1 when accelerating or decelerating. During stable driving, since the chain tensioning mechanism 300 has an adaptive effect, the impact force of the chain 200 on the guide plate 1 is relatively small. Therefore, when the vehicle accelerates or decelerates, the acceleration or deceleration is large, and the chain 200 exerts a relatively large force on the guide plate 1. When a larger impact force is applied, the guide plate 1 rotates under the action of the impact force. After the guide plate 1 rotates, the deformation of the spring sheet 2 increases, and the elastic reaction force generated thereby hinders the rotation of the guide plate 1, thereby making the guide plate 1 always keep in contact with the chain 200, thereby ensuring the tension of the chain 200 and the reliability of the transmission. When the acceleration or deceleration is completed and the speed of the vehicle tends to be stable, the guide plate 1 can adaptively rotate to a suitable position. Of course, the spring sheet 2 can also adaptively deform to a corresponding position, thereby further ensuring the contact between the guide plate 1 and the chain 200 and the reliability of the tension of the chain 200. Moreover, during the acceleration or deceleration process, the impact force of the chain 200 on the guide plate 1 increases, thereby causing the entire mechanism to vibrate more severely.The spring sheet 2 can offset part of the impact force and thus play a role in shock absorption. Furthermore, the spring sheet 2 is a multi-layer spring sheet superposition structure. Through the shock absorption of the spring sheet 2, the vibration of the entire mechanism is reduced, thereby ensuring the smooth operation of the mechanism.

[0029] In this embodiment, if Figure 2 and Figure 4 As shown, the guide plate 1 includes an arc-shaped plate body 11, and a rotating part 12 that rotates relative to the body 100 is provided at the left end of the arc-shaped plate body 11. The arc-shaped plate body 11 contacts the chain 200, so that the contact area between the arc-shaped plate body 11 and the chain 200 is small, and the impact force can better act on the guide plate 1, thereby enabling the guide plate 1 to quickly make adaptive rotation.

[0030] In this embodiment, since the impact force on the guide plate 1 is relatively large and the guide plate 1 is made of plastic, the material of the guide plate 1 is an existing material and is a conventional choice, such as Figure 2 and Figure 3 As shown, a resisting portion 13 is provided on the rotating portion 12, and the left end of the spring sheet 2 is in contact with the resisting portion 13, and a first card groove 19 is formed between the resisting portion 13 and the left end portion of the arc-shaped plate body 11, and a tongue portion 14 is provided at the bottom of the right end of the arc-shaped plate body 11, and the tongue portion 14 extends to the left, and a second card groove 21 is formed between the tongue portion 14 and the arc-shaped plate body 11, and an inner lining plate 6 is installed on the arc-shaped plate body 11, and the left end of the inner lining plate 6 is stuck in the first card groove 19, and the right end of the inner lining plate 6 is stuck in the second card groove 21, and the inner lining plate 6 can increase the structural strength of the guide plate 1, thereby improving the impact resistance of the guide plate 1 and improving the service life of the guide plate 1.

[0031] In this embodiment, if Figure 2 、 Figure 3 and Figure 4 As shown, a first clamping block 20 is provided on the end surface of the resisting portion 13 near the first clamping groove 19, and a wedge-shaped surface is provided on the outer surface of the first clamping block 20. A second clamping block 22 is provided on the end surface of the tongue portion 14 near the second clamping groove 21, and a wedge-shaped surface is also provided on the outer surface of the second clamping block 22. Figure 6As shown, both ends of the inner lining plate 6 are provided with avoidance gaps, and the first clamping block 20 and the second clamping block 22 are both located at the corresponding avoidance gaps. Preferably, the inner lining plate 6 is an inner lining steel plate. During installation, the inner lining plate 6 is clamped into the first clamping groove 19 and the second clamping groove 21, and then the inner lining plate 6 is pushed. After the inner lining plate 6 contacts the clamping block, the guide plate 1 is deformed. Since the guide plate 1 is a plastic part, the guide plate 1 can be deformed so that the inner lining plate 6 is clamped into the clamping groove. When the two ends of the inner lining plate 6 pass through the clamping block, the inner lining plate 6 is installed in place. At this time, the inner side of the inner lining plate 6 is limited by the bottom of the clamping groove, and the outer side of the inner lining plate 6 is limited by the clamping block, thereby preventing the inner lining plate 6 from being separated from the guide plate 1, and ensuring the reliability of the installation of the inner lining plate 6.

[0032] In this embodiment, if Figure 2 、 Figure 3 and Figure 4 As shown, the resisting portion 13 can be a square block or a triangular block, as long as it can abut against the spring sheet 2. Preferably, the contact surface of the resisting portion 13 that contacts the spring sheet 2 is an arc-shaped surface. That is, when the guide plate 1 is deformed, the contact position of the spring sheet 2 and the resisting portion 13 will change, thereby enabling the spring sheet 2 to better make adaptive deformation, and its contact position is not the same position, but changes continuously within a certain area, thereby ensuring the service life of the resisting portion 13.

[0033] When the impact force on the guide plate 1 is particularly large, such as during sudden acceleration or braking, the rotation amplitude of the guide plate 1 is large, and the deformation of the spring sheet 2 is also large, which is likely to cause the spring sheet 2 to fail, and then cause the entire tensioning mechanism to fail, thereby bringing unexpected risks. Therefore, in this embodiment, if Figure 2 、 Figure 3 and Figure 4 As shown, a hanging portion 15 is provided on the inner or outer side of the tongue 14, and a limiting portion 16 is provided on the inner side of the hanging portion 15. There is an accommodating gap between the limiting portion 16 and the tongue 14 to accommodate the spring piece 2. During the rotation of the guide plate 1, when the spring piece 2 contacts the limiting portion 16, the spring piece 2 can no longer continue to bend, and the guide plate 1 can no longer press the spring piece 2. In other words, the guide plate 1 no longer rotates at this time. However, the guide plate 1 is still in contact with the chain 200 at this time, thereby ensuring the tension of the chain 200. When the impact force gradually decreases, the guide plate 1 can adaptively change again.

[0034] In this embodiment, if Figure 2 、 Figure 3 and Figure 4As shown, a raised positioning post 17 is also provided at the bottom of the tongue 14, and a positioning hole corresponding to the positioning post 17 is opened at the right end of the spring sheet 2. The positioning post 17 passes through the positioning hole. Through the cooperation between the positioning post 17 and the positioning hole, the spring sheet 2 will not separate from the guide plate 1 during use, thereby ensuring the reliability of the tensioning mechanism.

[0035] In this embodiment, if Figure 5 As shown, a through hole is provided on the rotating part 12, and a screw 4 is set in the through hole. Further, the screw 4 is a step screw 4, and a gasket 5 is set on the small diameter rod of the step screw 4. There is always a gap between the end face of the rotating part 12 close to the gasket 5 and the gasket 5. A baffle 18 extending upward is provided on the outer wall of the arc-shaped plate body 11. During the initial installation, the chain 200 is between the baffle 18 and the gasket 5. During use, the chain 200 itself has a moving swing during the transmission process. Therefore, when the chain 200 swings outward, the chain 200 is in contact with the baffle. The plate 18 collides, thereby driving the guide plate 1 away from the sleeve 5, and when the chain 200 swings inward, the contact area between the chain 200 and the guide plate 1 is small, making it difficult for the rotating part 12 to approach the sleeve 5. Furthermore, when the rotating part 12 abuts against the head of the screw 4, there is a gap of 0.5 mm between the sleeve 5 and the rotating part 12, and the swing amplitude of the chain 200 itself is not large. Therefore, when in use, it can ensure that the rotating part 12 does not contact the sleeve 5, thereby ensuring that the guide plate 1 can rotate around the screw 4, thereby ensuring the reliability of the use of the tensioning mechanism.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A chain tensioning mechanism, characterized in that: It includes a fixedly installed limit pin, a rotatably installed guide plate and a spring sheet, one end of the guide plate is a rotating part, the spring sheet is located between the limit pin and the guide plate, and the spring sheet is bent with the limit pin as a fulcrum, and the two ends of the spring sheet are respectively in contact with the two ends of the guide plate.

2. A chain tensioning mechanism according to claim 1, characterized in that: The guide plate includes an arc-shaped plate body, and the rotating part is provided at the left end of the arc-shaped plate body.

3. A chain tensioning mechanism according to claim 2, characterized in that: A resisting portion is provided on the rotating portion, and the left end of the spring sheet abuts against the resisting portion, and a first slot is formed between the resisting portion and the left end portion of the arc-shaped plate body. A tongue portion is provided at the bottom of the right end of the arc-shaped plate body, and the tongue portion extends to the left, and a second slot is formed between the tongue portion and the arc-shaped plate body. An inner lining plate is installed on the arc-shaped plate body, and the left end of the inner lining plate is stuck in the first slot, and the right end of the inner lining plate is stuck in the second slot.

4. A chain tensioning mechanism according to claim 3, characterized in that: A first clamping block is provided on the end surface of the resisting portion close to the first clamping slot, and a wedge-shaped surface is provided on the outer side surface of the first clamping block. A second clamping block is provided on the end surface of the tongue portion close to the second clamping slot, and a wedge-shaped surface is also provided on the outer side surface of the second clamping block. Avoidance notches are provided on both the left and right ends of the inner lining plate, and the first clamping block and the second clamping block are both located at the corresponding avoidance notches.

5. The chain tensioning mechanism according to claim 3, characterized in that: The contact surface of the resisting portion that contacts the spring sheet is an arc-shaped surface.

6. The chain tensioning mechanism according to claim 3, characterized in that: A hanging portion is provided on the inner side or the outer side of the tongue portion, a limiting portion is provided on the inner side surface of the hanging portion, and an accommodating gap for accommodating the spring sheet is provided between the limiting portion and the tongue portion.

7. The chain tensioning mechanism according to claim 3, characterized in that: A raised positioning post is further provided at the bottom of the tongue, and a positioning hole corresponding to the positioning post is opened at the right end of the spring sheet, and the positioning post passes through the positioning hole.

8. A chain tensioning mechanism according to any one of claims 2 to 7, characterized in that: A through hole is provided on the rotating part, and a screw is sleeved in the through hole.

9. The chain tensioning mechanism according to claim 8, characterized in that: The screw is a stepped screw, and a sleeve is mounted on the small diameter rod of the stepped screw. There is always a gap between the end surface of the rotating part close to the sleeve and the sleeve, and a baffle extending upward is provided on the outer side wall of the arc-shaped plate.

10. The chain tensioning mechanism according to claim 1, characterized in that: The spring sheet is a multi-layer spring sheet superposition structure.

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